Move test to pytest plugin tests where it belongs

- test needs installed pyfakefs
- shall fix #687

pyfakefs/pytest_tests/pytest_plugin_test.py

@@ -2,6 +2,8 @@
 import os
 import tempfile
 
+import pytest
+
 from pyfakefs.fake_filesystem_unittest import Pause
 
 
@@ -50,3 +52,13 @@ def test_pause_resume_contextmanager(fs):
         assert os.path.exists(real_temp_file.name)
     assert not os.path.exists(real_temp_file.name)
     assert os.path.exists(fake_temp_file.name)
+
+
+class TestModuleScopedFsWithTmpdir:
+    @pytest.fixture(autouse=True)
+    def test_internal(self, tmpdir):
+        yield
+
+    def test_fail(self, fs_module):
+        # Regression test for #684
+        assert True

pyfakefs/tests/fake_filesystem_unittest_test.py

@@ -32,8 +32,6 @@
 from pathlib import Path
 from unittest import TestCase, mock
 
-import pytest
-
 import pyfakefs.tests.import_as_example
 import pyfakefs.tests.logsio
 from pyfakefs import fake_filesystem_unittest, fake_filesystem
@@ -881,15 +879,5 @@ def test_is_absolute(self, fs):
         self.assertTrue(pathlib.Path(".").absolute().is_absolute())
 
 
-class TestModuleScopedFsWithTmpdir:
-    @pytest.fixture(autouse=True)
-    def test_internal(self, tmpdir):
-        yield
-
-    def test_fail(self, fs_module):
-        # Regression test for #684
-        assert True
-
-
 if __name__ == "__main__":
     unittest.main()